The Crepuscular rays reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Crepuscular rays

Crepuscular rays a term used in atmospheric optics for when light beams scattered by clouds in front of the setting sun appear to diverge. The rays are parallel, but appear to diverge because of parallax.

See:

• http://www.sundog.clara.co.uk/atoptics/ray1.htm
• anticrepuscular rays

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